单项选择题

To have a knowledge-based economy and a scientifically ______ population, developing countries must invest in fundamental science and blue skies research.

A．moderate
B．obsolete
C．literate
D．desperate
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单项选择题
The widowed old woman was so lonely that she would talk ______ to the strangers in the supermarkets about her pets.
A．at best
B．at length
C．in bulk
D．in effect
单项选择题
When the relationship of parents and children is at this low ______, mutual love and respect need careful maintenance and rebuilding.
A．rate
B．rank
C．scale
D．ebb
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